LU6.2 BIND Rejected When Connecting through 3174 NN

ID: Q237186

The information in this article applies to:

Microsoft SNA Server, versions 2.11, 2.11 SP1, 2.11 SP2, 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3

SYMPTOMS

When a Microsoft SNA Server operator attempts to verify LU 6.2 session availability for a given APPC triplet (for example local LU, remote LU, and mode name) using the APPC Session Viewer utility, the test completes successfully, returning the negotiated session limits and the number of sessions that are currently in use. However, when a Transaction Program (TP) subsequently attempts to allocate a conversation using the same APPC triplet, the host may reject the SNA Server BIND request with an 08210002 (Invalid Session Parameters) sense code. The following error message occurs in the Windows NT Application Event log:


Event ID: 18
Source  : SNA Server

APPC session activation failure: BIND negative response or UNBIND request received

   Sense data   = 08210002   
   Connection   = <connection name>
   LU alias     = <lu name>
   PLU alias    = <plu alias>
   Mode name    = <mode name>

This particular problem has been observed in LU 6.2 environments, where SNA Server has been configured to work with 3174 Networking Nodes and the upper layer APPC/CPIC application *requires* contention winner sessions.

CAUSE

Even though a successful CNOS negotiation has occurred between the partner LUs, the IBM 3174 controller is unable to honor contention winner session requests initiated by downstream PU 2.1 devices, because the APPC mode name specified in the BIND request is not defined in the IBM 3174 configuration.

RESOLUTION

Configure the IBM 3174 controller so that it recognizes the application mode name specified in the BIND request.

MORE INFORMATION

If the 3174 controller is configured as an APPN Networking Node, the 3174 is responsible for LU session class of service (COS) routing. The application mode name defined in SNA Server must also be defined in the 3174 so that proper session routing takes place when the BIND image is received by the 3174. Well known modes, such as #BATCH, #BATCHSC, #INTER or #INTERSC are predefined on the 3174, and therefore, do not need to be configured.

The steps outlined in the following Microsoft Knowledge Base article may not be sufficient when the remote end (SNA Server) is issuing the LU6.2 BIND request over an application mode that is not recognized by the 3174:

Q107569 Configuring for LU 6.2 Through a 3174 APPN Network Node

To properly configure the 3174, please follow the steps outlined in the 3174 Establishment Controller Planning Guide (P/N GA27-3918-02) or contact IBM for detailed assistance.

Additional query words:

Keywords :
Version : WINDOWS:2.11,2.11 SP1,2.11 SP2,3.0,3.0 SP1,3.0 SP2,3.0 SP3,3.0 SP4,4.0,4.0 SP1,4.0 SP2,4.0 SP3
Platform : WINDOWS
Issue type :